We'll need to know more about your computer and network equipments to help you out.
There are many options beside VPN you can take, VPN seems to be a much more expensive and complicating task to configure. You can go with remote software solution which requires little knowledge and effort. Take a look at VNC, Radmin, PCAnywhere and Windows RDC.
There's also website that could help you achieved this simple process of connecting to your home computer like logmein.com.